Упростите выражение:1)12•a•5•2=
2)4b•25•7=
3)15s•9•4=
4)9x+7x+3x=
5)15y-6y+8y=
6)52x-16x+9x=
7)8(+6)-28=
8)7(2x+3)-10x=
9)4(9x+7)-26x=
ЗАРАНИЕ СПАСИБО!!!
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